| Message ID | 20210302125751.19080-3-wangyanan55@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: selftests: some improvement and a new test for kvm page table | expand |
On Tue, Mar 02, 2021 at 08:57:44PM +0800, Yanan Wang wrote: > We know that if a system supports multiple hugetlb page sizes, > the desired hugetlb page size can be specified in bits [26:31] > of the flag arguments. The value in these 6 bits will be the > shift of each hugetlb page size. > > So add a macro to get the page size shift and then calculate the > corresponding hugetlb page size, using flag x. > > Cc: Ben Gardon <bgardon@google.com> > Cc: Ingo Molnar <mingo@kernel.org> > Cc: Adrian Hunter <adrian.hunter@intel.com> > Cc: Jiri Olsa <jolsa@redhat.com> > Cc: Arnaldo Carvalho de Melo <acme@redhat.com> > Cc: Arnd Bergmann <arnd@arndb.de> > Cc: Michael Kerrisk <mtk.manpages@gmail.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Suggested-by: Ben Gardon <bgardon@google.com> > Signed-off-by: Yanan Wang <wangyanan55@huawei.com> > Reviewed-by: Ben Gardon <bgardon@google.com> > --- > include/uapi/linux/mman.h | 2 ++ > tools/include/uapi/linux/mman.h | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h > index f55bc680b5b0..8bd41128a0ee 100644 > --- a/include/uapi/linux/mman.h > +++ b/include/uapi/linux/mman.h > @@ -41,4 +41,6 @@ > #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB > #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB > > +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) Needs to be '1ULL' to avoid shift overflow when given MAP_HUGE_16GB. Thanks, drew > + > #endif /* _UAPI_LINUX_MMAN_H */ > diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h > index f55bc680b5b0..8bd41128a0ee 100644 > --- a/tools/include/uapi/linux/mman.h > +++ b/tools/include/uapi/linux/mman.h > @@ -41,4 +41,6 @@ > #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB > #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB > > +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) > + > #endif /* _UAPI_LINUX_MMAN_H */ > -- > 2.23.0 >
On 2021/3/12 19:14, Andrew Jones wrote: > On Tue, Mar 02, 2021 at 08:57:44PM +0800, Yanan Wang wrote: >> We know that if a system supports multiple hugetlb page sizes, >> the desired hugetlb page size can be specified in bits [26:31] >> of the flag arguments. The value in these 6 bits will be the >> shift of each hugetlb page size. >> >> So add a macro to get the page size shift and then calculate the >> corresponding hugetlb page size, using flag x. >> >> Cc: Ben Gardon <bgardon@google.com> >> Cc: Ingo Molnar <mingo@kernel.org> >> Cc: Adrian Hunter <adrian.hunter@intel.com> >> Cc: Jiri Olsa <jolsa@redhat.com> >> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> >> Cc: Arnd Bergmann <arnd@arndb.de> >> Cc: Michael Kerrisk <mtk.manpages@gmail.com> >> Cc: Thomas Gleixner <tglx@linutronix.de> >> Suggested-by: Ben Gardon <bgardon@google.com> >> Signed-off-by: Yanan Wang <wangyanan55@huawei.com> >> Reviewed-by: Ben Gardon <bgardon@google.com> >> --- >> include/uapi/linux/mman.h | 2 ++ >> tools/include/uapi/linux/mman.h | 2 ++ >> 2 files changed, 4 insertions(+) >> >> diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h >> index f55bc680b5b0..8bd41128a0ee 100644 >> --- a/include/uapi/linux/mman.h >> +++ b/include/uapi/linux/mman.h >> @@ -41,4 +41,6 @@ >> #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB >> #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB >> >> +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) > Needs to be '1ULL' to avoid shift overflow when given MAP_HUGE_16GB. Thanks, drew. Will fix it. > Thanks, > drew > >> + >> #endif /* _UAPI_LINUX_MMAN_H */ >> diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h >> index f55bc680b5b0..8bd41128a0ee 100644 >> --- a/tools/include/uapi/linux/mman.h >> +++ b/tools/include/uapi/linux/mman.h >> @@ -41,4 +41,6 @@ >> #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB >> #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB >> >> +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) >> + >> #endif /* _UAPI_LINUX_MMAN_H */ >> -- >> 2.23.0 >> > .
diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h index f55bc680b5b0..8bd41128a0ee 100644 --- a/include/uapi/linux/mman.h +++ b/include/uapi/linux/mman.h @@ -41,4 +41,6 @@ #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) + #endif /* _UAPI_LINUX_MMAN_H */ diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h index f55bc680b5b0..8bd41128a0ee 100644 --- a/tools/include/uapi/linux/mman.h +++ b/tools/include/uapi/linux/mman.h @@ -41,4 +41,6 @@ #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) + #endif /* _UAPI_LINUX_MMAN_H */