[v3,05/15] futex: Add sys_futex_wake()

Message ID	20230921105247.936205525@noisy.programming.kicks-ass.net (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> Message-Id: <20230921105247.936205525@noisy.programming.kicks-ass.net> User-Agent: quilt/0.65 Date: Thu, 21 Sep 2023 12:45:10 +0200 From: peterz@infradead.org To: tglx@linutronix.de, axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@redhat.com, dvhart@infradead.org, dave@stgolabs.net, andrealmeid@igalia.com, Andrew Morton <akpm@linux-foundation.org>, urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com, Arnd Bergmann <arnd@arndb.de>, linux-api@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, malteskarupke@web.de, Geert Uytterhoeven <geert@linux-m68k.org> Subject: [PATCH v3 05/15] futex: Add sys_futex_wake() References: <20230921104505.717750284@noisy.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline; filename=peterz-futex2-wake.patch Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	futex: More futex2 bits \| expand [v3,00/15] futex: More futex2 bits [v3,01/15] futex: Clarify FUTEX2 flags [v3,02/15] futex: Extend the FUTEX2 flags [v3,03/15] futex: Flag conversion [v3,04/15] futex: Validate futex value against futex size [v3,05/15] futex: Add sys_futex_wake() [v3,06/15] futex: FLAGS_STRICT [v3,07/15] futex: Add sys_futex_wait() [v3,08/15] futex: Propagate flags into get_futex_key() [v3,09/15] futex: Add flags2 argument to futex_requeue() [v3,10/15] futex: Add sys_futex_requeue() [v3,11/15] mm: Add vmalloc_huge_node() [v3,12/15] futex: Implement FUTEX2_NUMA [v3,13/15] futex: Propagate flags into futex_get_value_locked() [v3,14/15] futex: Enable FUTEX2_{8,16} [v3,15/15] futex,selftests: Extend the futex selftests [17/15,HACK] futex: Force futex hash collision

Index: linux-2.6/arch/alpha/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/alpha/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/alpha/kernel/syscalls/syscall.tbl @@ -492,3 +492,4 @@ 560 common set_mempolicy_home_node sys_ni_syscall 561 common cachestat sys_cachestat 562 common fchmodat2 sys_fchmodat2 +563 common futex_wake sys_futex_wake Index: linux-2.6/arch/arm/tools/syscall.tbl =================================================================== --- linux-2.6.orig/arch/arm/tools/syscall.tbl +++ linux-2.6/arch/arm/tools/syscall.tbl @@ -466,3 +466,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/arm64/include/asm/unistd.h =================================================================== --- linux-2.6.orig/arch/arm64/include/asm/unistd.h +++ linux-2.6/arch/arm64/include/asm/unistd.h @@ -39,7 +39,7 @@ #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5) #define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800) -#define __NR_compat_syscalls 453 +#define __NR_compat_syscalls 455 #endif #define __ARCH_WANT_SYS_CLONE Index: linux-2.6/arch/arm64/include/asm/unistd32.h =================================================================== --- linux-2.6.orig/arch/arm64/include/asm/unistd32.h +++ linux-2.6/arch/arm64/include/asm/unistd32.h @@ -911,6 +911,8 @@ __SYSCALL(__NR_set_mempolicy_home_node, __SYSCALL(__NR_cachestat, sys_cachestat) #define __NR_fchmodat2 452 __SYSCALL(__NR_fchmodat2, sys_fchmodat2) +#define __NR_futex_wake 454 +__SYSCALL(__NR_futex_wake, sys_futex_wake) /* * Please add new compat syscalls above this comment and update Index: linux-2.6/arch/ia64/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/ia64/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/ia64/kernel/syscalls/syscall.tbl @@ -373,3 +373,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/m68k/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/m68k/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/m68k/kernel/syscalls/syscall.tbl @@ -452,3 +452,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/microblaze/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/microblaze/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/microblaze/kernel/syscalls/syscall.tbl @@ -458,3 +458,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/mips/kernel/syscalls/syscall_n32.tbl =================================================================== --- linux-2.6.orig/arch/mips/kernel/syscalls/syscall_n32.tbl +++ linux-2.6/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -391,3 +391,4 @@ 450 n32 set_mempolicy_home_node sys_set_mempolicy_home_node 451 n32 cachestat sys_cachestat 452 n32 fchmodat2 sys_fchmodat2 +454 n32 futex_wake sys_futex_wake Index: linux-2.6/arch/mips/kernel/syscalls/syscall_n64.tbl =================================================================== --- linux-2.6.orig/arch/mips/kernel/syscalls/syscall_n64.tbl +++ linux-2.6/arch/mips/kernel/syscalls/syscall_n64.tbl @@ -367,3 +367,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 n64 cachestat sys_cachestat 452 n64 fchmodat2 sys_fchmodat2 +454 n64 futex_wake sys_futex_wake Index: linux-2.6/arch/mips/kernel/syscalls/syscall_o32.tbl =================================================================== --- linux-2.6.orig/arch/mips/kernel/syscalls/syscall_o32.tbl +++ linux-2.6/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -440,3 +440,4 @@ 450 o32 set_mempolicy_home_node sys_set_mempolicy_home_node 451 o32 cachestat sys_cachestat 452 o32 fchmodat2 sys_fchmodat2 +454 o32 futex_wake sys_futex_wake Index: linux-2.6/arch/parisc/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/parisc/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/parisc/kernel/syscalls/syscall.tbl @@ -451,3 +451,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/powerpc/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/powerpc/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/powerpc/kernel/syscalls/syscall.tbl @@ -539,3 +539,4 @@ 450 nospu set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/s390/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/s390/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/s390/kernel/syscalls/syscall.tbl @@ -455,3 +455,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake sys_futex_wake Index: linux-2.6/arch/sh/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/sh/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/sh/kernel/syscalls/syscall.tbl @@ -455,3 +455,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/sparc/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/sparc/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/sparc/kernel/syscalls/syscall.tbl @@ -498,3 +498,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/arch/x86/entry/syscalls/syscall_32.tbl =================================================================== --- linux-2.6.orig/arch/x86/entry/syscalls/syscall_32.tbl +++ linux-2.6/arch/x86/entry/syscalls/syscall_32.tbl @@ -457,3 +457,4 @@ 450 i386 set_mempolicy_home_node sys_set_mempolicy_home_node 451 i386 cachestat sys_cachestat 452 i386 fchmodat2 sys_fchmodat2 +454 i386 futex_wake sys_futex_wake Index: linux-2.6/arch/x86/entry/syscalls/syscall_64.tbl =================================================================== --- linux-2.6.orig/arch/x86/entry/syscalls/syscall_64.tbl +++ linux-2.6/arch/x86/entry/syscalls/syscall_64.tbl @@ -375,6 +375,7 @@ 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 453 64 map_shadow_stack sys_map_shadow_stack +454 common futex_wake sys_futex_wake # # Due to a historical design error, certain syscalls are numbered differently Index: linux-2.6/arch/xtensa/kernel/syscalls/syscall.tbl =================================================================== --- linux-2.6.orig/arch/xtensa/kernel/syscalls/syscall.tbl +++ linux-2.6/arch/xtensa/kernel/syscalls/syscall.tbl @@ -423,3 +423,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common fchmodat2 sys_fchmodat2 +454 common futex_wake sys_futex_wake Index: linux-2.6/include/linux/syscalls.h =================================================================== --- linux-2.6.orig/include/linux/syscalls.h +++ linux-2.6/include/linux/syscalls.h @@ -549,6 +549,9 @@ asmlinkage long sys_set_robust_list(stru asmlinkage long sys_futex_waitv(struct futex_waitv *waiters, unsigned int nr_futexes, unsigned int flags, struct __kernel_timespec __user *timeout, clockid_t clockid); + +asmlinkage long sys_futex_wake(void __user *uaddr, unsigned long mask, int nr, unsigned int flags); + asmlinkage long sys_nanosleep(struct __kernel_timespec __user *rqtp, struct __kernel_timespec __user *rmtp); asmlinkage long sys_nanosleep_time32(struct old_timespec32 __user *rqtp, Index: linux-2.6/include/uapi/asm-generic/unistd.h =================================================================== --- linux-2.6.orig/include/uapi/asm-generic/unistd.h +++ linux-2.6/include/uapi/asm-generic/unistd.h @@ -822,9 +822,11 @@ __SYSCALL(__NR_cachestat, sys_cachestat) #define __NR_fchmodat2 452 __SYSCALL(__NR_fchmodat2, sys_fchmodat2) +#define __NR_futex_wake 454 +__SYSCALL(__NR_futex_wake, sys_futex_wake) #undef __NR_syscalls -#define __NR_syscalls 453 +#define __NR_syscalls 455 /* * 32 bit systems traditionally used different Index: linux-2.6/kernel/futex/syscalls.c =================================================================== --- linux-2.6.orig/kernel/futex/syscalls.c +++ linux-2.6/kernel/futex/syscalls.c @@ -306,6 +306,36 @@ destroy_timer: return ret; } +/* + * sys_futex_wake - Wake a number of futexes + * @uaddr: Address of the futex(es) to wake + * @mask: bitmask + * @nr: Number of the futexes to wake + * @flags: FUTEX2 flags + * + * Identical to the traditional FUTEX_WAKE_BITSET op, except it is part of the + * futex2 family of calls. + */ + +SYSCALL_DEFINE4(futex_wake, + void __user *, uaddr, + unsigned long, mask, + int, nr, + unsigned int, flags) +{ + if (flags & ~FUTEX2_VALID_MASK) + return -EINVAL; + + flags = futex2_to_flags(flags); + if (!futex_flags_valid(flags)) + return -EINVAL; + + if (!futex_validate_input(flags, mask)) + return -EINVAL; + + return futex_wake(uaddr, flags, nr, mask); +} + #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE2(set_robust_list, struct compat_robust_list_head __user *, head, Index: linux-2.6/kernel/sys_ni.c =================================================================== --- linux-2.6.orig/kernel/sys_ni.c +++ linux-2.6/kernel/sys_ni.c @@ -87,6 +87,7 @@ COND_SYSCALL_COMPAT(set_robust_list); COND_SYSCALL(get_robust_list); COND_SYSCALL_COMPAT(get_robust_list); COND_SYSCALL(futex_waitv); +COND_SYSCALL(futex_wake); COND_SYSCALL(kexec_load); COND_SYSCALL_COMPAT(kexec_load); COND_SYSCALL(init_module);

[v3,05/15] futex: Add sys_futex_wake()

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