| Message ID | 20240318142138.783350-3-bhe@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mm_init.c: refactor free_area_init_core() | expand |
Hi Baoquan, On Mon, Mar 18, 2024 at 10:21:34PM +0800, Baoquan He wrote: > This is not needed any more. I'd swap this and the first patch, so that the first patch would remove memblock_find_dma_reserve() and it's changelog will explain why it's not needed and then the second patch will simply drop unused set_dma_reserve() > Signed-off-by: Baoquan He <bhe@redhat.com> > --- > arch/x86/include/asm/pgtable.h | 1 - > arch/x86/kernel/setup.c | 2 -- > arch/x86/mm/init.c | 45 ---------------------------------- > 3 files changed, 48 deletions(-) > > diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h > index 315535ffb258..cefc7a84f7a4 100644 > --- a/arch/x86/include/asm/pgtable.h > +++ b/arch/x86/include/asm/pgtable.h > @@ -1200,7 +1200,6 @@ static inline int pgd_none(pgd_t pgd) > extern int direct_gbpages; > void init_mem_mapping(void); > void early_alloc_pgt_buf(void); > -extern void memblock_find_dma_reserve(void); > void __init poking_init(void); > unsigned long init_memory_mapping(unsigned long start, > unsigned long end, pgprot_t prot); > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c > index 3e1e96efadfe..5aa00938051f 100644 > --- a/arch/x86/kernel/setup.c > +++ b/arch/x86/kernel/setup.c > @@ -1106,8 +1106,6 @@ void __init setup_arch(char **cmdline_p) > */ > arch_reserve_crashkernel(); > > - memblock_find_dma_reserve(); > - > if (!early_xdbc_setup_hardware()) > early_xdbc_register_console(); > > diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c > index 5209549e8192..615f0bf4bda6 100644 > --- a/arch/x86/mm/init.c > +++ b/arch/x86/mm/init.c > @@ -990,51 +990,6 @@ void __init free_initrd_mem(unsigned long start, unsigned long end) > } > #endif > > -/* > - * Calculate the precise size of the DMA zone (first 16 MB of RAM), > - * and pass it to the MM layer - to help it set zone watermarks more > - * accurately. > - * > - * Done on 64-bit systems only for the time being, although 32-bit systems > - * might benefit from this as well. > - */ > -void __init memblock_find_dma_reserve(void) > -{ > -#ifdef CONFIG_X86_64 > - u64 nr_pages = 0, nr_free_pages = 0; > - unsigned long start_pfn, end_pfn; > - phys_addr_t start_addr, end_addr; > - int i; > - u64 u; > - > - /* > - * Iterate over all memory ranges (free and reserved ones alike), > - * to calculate the total number of pages in the first 16 MB of RAM: > - */ > - nr_pages = 0; > - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { > - start_pfn = min(start_pfn, MAX_DMA_PFN); > - end_pfn = min(end_pfn, MAX_DMA_PFN); > - > - nr_pages += end_pfn - start_pfn; > - } > - > - /* > - * Iterate over free memory ranges to calculate the number of free > - * pages in the DMA zone, while not counting potential partial > - * pages at the beginning or the end of the range: > - */ > - nr_free_pages = 0; > - for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end_addr, NULL) { > - start_pfn = min_t(unsigned long, PFN_UP(start_addr), MAX_DMA_PFN); > - end_pfn = min_t(unsigned long, PFN_DOWN(end_addr), MAX_DMA_PFN); > - > - if (start_pfn < end_pfn) > - nr_free_pages += end_pfn - start_pfn; > - } > -#endif > -} > - > void __init zone_sizes_init(void) > { > unsigned long max_zone_pfns[MAX_NR_ZONES]; > -- > 2.41.0 >
On 03/19/24 at 05:49pm, Mike Rapoport wrote: > Hi Baoquan, > > On Mon, Mar 18, 2024 at 10:21:34PM +0800, Baoquan He wrote: > > This is not needed any more. > > I'd swap this and the first patch, so that the first patch would remove > memblock_find_dma_reserve() and it's changelog will explain why it's not > needed and then the second patch will simply drop unused set_dma_reserve() Thanks, Mike. My thought on the patch 1/2 splitting is: patch 1 is removing all relevant codes in mm, including the usage of dma_reserve in free_area_init_core() and exporting set_dma_reserve() to any ARCH which want to subtract the dma_reserve from DMA zone. Patch 2 purely remove the code in x86 ARCH about how to get dma_reserve. Your suggestion is also good to me, I can rearrange the order and repost.
On Wed, Mar 20, 2024 at 03:52:52PM +0800, Baoquan He wrote: > On 03/19/24 at 05:49pm, Mike Rapoport wrote: > > Hi Baoquan, > > > > On Mon, Mar 18, 2024 at 10:21:34PM +0800, Baoquan He wrote: > > > This is not needed any more. > > > > I'd swap this and the first patch, so that the first patch would remove > > memblock_find_dma_reserve() and it's changelog will explain why it's not > > needed and then the second patch will simply drop unused set_dma_reserve() > > Thanks, Mike. > > My thought on the patch 1/2 splitting is: > patch 1 is removing all relevant codes in mm, including the usage of > dma_reserve in free_area_init_core() and exporting set_dma_reserve() > to any ARCH which want to subtract the dma_reserve from DMA zone. > > Patch 2 purely remove the code in x86 ARCH about how to get dma_reserve. I think it's better first to remove the usage of set_dma_reserve() in x86 and then clean up the unused code. > Your suggestion is also good to me, I can rearrange the order and > repost.
On 03/20/24 at 11:36am, Mike Rapoport wrote: > On Wed, Mar 20, 2024 at 03:52:52PM +0800, Baoquan He wrote: > > On 03/19/24 at 05:49pm, Mike Rapoport wrote: > > > Hi Baoquan, > > > > > > On Mon, Mar 18, 2024 at 10:21:34PM +0800, Baoquan He wrote: > > > > This is not needed any more. > > > > > > I'd swap this and the first patch, so that the first patch would remove > > > memblock_find_dma_reserve() and it's changelog will explain why it's not > > > needed and then the second patch will simply drop unused set_dma_reserve() > > > > Thanks, Mike. > > > > My thought on the patch 1/2 splitting is: > > patch 1 is removing all relevant codes in mm, including the usage of > > dma_reserve in free_area_init_core() and exporting set_dma_reserve() > > to any ARCH which want to subtract the dma_reserve from DMA zone. > > > > Patch 2 purely remove the code in x86 ARCH about how to get dma_reserve. > > I think it's better first to remove the usage of set_dma_reserve() in x86 > and then clean up the unused code. OK, firslty remove the only user, that sounds reasonable. Will change. Thanks.
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 315535ffb258..cefc7a84f7a4 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1200,7 +1200,6 @@ static inline int pgd_none(pgd_t pgd) extern int direct_gbpages; void init_mem_mapping(void); void early_alloc_pgt_buf(void); -extern void memblock_find_dma_reserve(void); void __init poking_init(void); unsigned long init_memory_mapping(unsigned long start, unsigned long end, pgprot_t prot); diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 3e1e96efadfe..5aa00938051f 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1106,8 +1106,6 @@ void __init setup_arch(char **cmdline_p) */ arch_reserve_crashkernel(); - memblock_find_dma_reserve(); - if (!early_xdbc_setup_hardware()) early_xdbc_register_console(); diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 5209549e8192..615f0bf4bda6 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -990,51 +990,6 @@ void __init free_initrd_mem(unsigned long start, unsigned long end) } #endif -/* - * Calculate the precise size of the DMA zone (first 16 MB of RAM), - * and pass it to the MM layer - to help it set zone watermarks more - * accurately. - * - * Done on 64-bit systems only for the time being, although 32-bit systems - * might benefit from this as well. - */ -void __init memblock_find_dma_reserve(void) -{ -#ifdef CONFIG_X86_64 - u64 nr_pages = 0, nr_free_pages = 0; - unsigned long start_pfn, end_pfn; - phys_addr_t start_addr, end_addr; - int i; - u64 u; - - /* - * Iterate over all memory ranges (free and reserved ones alike), - * to calculate the total number of pages in the first 16 MB of RAM: - */ - nr_pages = 0; - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { - start_pfn = min(start_pfn, MAX_DMA_PFN); - end_pfn = min(end_pfn, MAX_DMA_PFN); - - nr_pages += end_pfn - start_pfn; - } - - /* - * Iterate over free memory ranges to calculate the number of free - * pages in the DMA zone, while not counting potential partial - * pages at the beginning or the end of the range: - */ - nr_free_pages = 0; - for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end_addr, NULL) { - start_pfn = min_t(unsigned long, PFN_UP(start_addr), MAX_DMA_PFN); - end_pfn = min_t(unsigned long, PFN_DOWN(end_addr), MAX_DMA_PFN); - - if (start_pfn < end_pfn) - nr_free_pages += end_pfn - start_pfn; - } -#endif -} - void __init zone_sizes_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES];
This is not needed any more. Signed-off-by: Baoquan He <bhe@redhat.com> --- arch/x86/include/asm/pgtable.h | 1 - arch/x86/kernel/setup.c | 2 -- arch/x86/mm/init.c | 45 ---------------------------------- 3 files changed, 48 deletions(-)