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Wed, 29 Jul 2020 22:22:21 -0400 X-MC-Unique: x5Uy2qT2P5q-DIcPrk6VSQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 90479801504; Thu, 30 Jul 2020 02:22:16 +0000 (UTC) Received: from localhost (ovpn-13-67.pek2.redhat.com [10.72.13.67]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 62E1519D82; Thu, 30 Jul 2020 02:22:15 +0000 (UTC) Date: Thu, 30 Jul 2020 10:22:09 +0800 From: Baoquan He To: Mike Rapoport Subject: Re: [PATCH 11/15] memblock: reduce number of parameters in for_each_mem_range() Message-ID: <20200730022209.GK14854@MiWiFi-R3L-srv> References: <20200728051153.1590-1-rppt@kernel.org> <20200728051153.1590-12-rppt@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200728051153.1590-12-rppt@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200729_222225_794956_5A2240AC X-CRM114-Status: GOOD ( 27.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-sh@vger.kernel.org, Peter Zijlstra , Benjamin Herrenschmidt , Dave Hansen , linux-mips@vger.kernel.org, Max Filippov , Paul Mackerras , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Will Deacon , Stafford Horne , Marek Szyprowski , linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Yoshinori Sato , Michael Ellerman , x86@kernel.org, Russell King , Mike Rapoport , clang-built-linux@googlegroups.com, Ingo Molnar , Catalin Marinas , uclinux-h8-devel@lists.sourceforge.jp, linux-xtensa@linux-xtensa.org, openrisc@lists.librecores.org, Borislav Petkov , Andy Lutomirski , Paul Walmsley , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Michal Simek , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Palmer Dabbelt , Andrew Morton , Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 07/28/20 at 08:11am, Mike Rapoport wrote: > From: Mike Rapoport > > Currently for_each_mem_range() iterator is the most generic way to traverse > memblock regions. As such, it has 8 parameters and it is hardly convenient > to users. Most users choose to utilize one of its wrappers and the only > user that actually needs most of the parameters outside memblock is s390 > crash dump implementation. > > To avoid yet another naming for memblock iterators, rename the existing > for_each_mem_range() to __for_each_mem_range() and add a new > for_each_mem_range() wrapper with only index, start and end parameters. > > The new wrapper nicely fits into init_unavailable_mem() and will be used in > upcoming changes to simplify memblock traversals. > > Signed-off-by: Mike Rapoport > --- > .clang-format | 1 + > arch/arm64/kernel/machine_kexec_file.c | 6 ++---- > arch/s390/kernel/crash_dump.c | 8 ++++---- > include/linux/memblock.h | 18 ++++++++++++++---- > mm/page_alloc.c | 3 +-- > 5 files changed, 22 insertions(+), 14 deletions(-) Reviewed-by: Baoquan He > > diff --git a/.clang-format b/.clang-format > index a0a96088c74f..52ededab25ce 100644 > --- a/.clang-format > +++ b/.clang-format > @@ -205,6 +205,7 @@ ForEachMacros: > - 'for_each_memblock_type' > - 'for_each_memcg_cache_index' > - 'for_each_mem_pfn_range' > + - '__for_each_mem_range' > - 'for_each_mem_range' > - 'for_each_mem_range_rev' > - 'for_each_migratetype_order' > diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c > index 361a1143e09e..5b0e67b93cdc 100644 > --- a/arch/arm64/kernel/machine_kexec_file.c > +++ b/arch/arm64/kernel/machine_kexec_file.c > @@ -215,8 +215,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz) > phys_addr_t start, end; > > nr_ranges = 1; /* for exclusion of crashkernel region */ > - for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, > - MEMBLOCK_NONE, &start, &end, NULL) > + for_each_mem_range(i, &start, &end) > nr_ranges++; > > cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL); > @@ -225,8 +224,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz) > > cmem->max_nr_ranges = nr_ranges; > cmem->nr_ranges = 0; > - for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, > - MEMBLOCK_NONE, &start, &end, NULL) { > + for_each_mem_range(i, &start, &end) { > cmem->ranges[cmem->nr_ranges].start = start; > cmem->ranges[cmem->nr_ranges].end = end - 1; > cmem->nr_ranges++; > diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c > index f96a5857bbfd..e28085c725ff 100644 > --- a/arch/s390/kernel/crash_dump.c > +++ b/arch/s390/kernel/crash_dump.c > @@ -549,8 +549,8 @@ static int get_mem_chunk_cnt(void) > int cnt = 0; > u64 idx; > > - for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, > - MEMBLOCK_NONE, NULL, NULL, NULL) > + __for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, > + MEMBLOCK_NONE, NULL, NULL, NULL) > cnt++; > return cnt; > } > @@ -563,8 +563,8 @@ static void loads_init(Elf64_Phdr *phdr, u64 loads_offset) > phys_addr_t start, end; > u64 idx; > > - for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, > - MEMBLOCK_NONE, &start, &end, NULL) { > + __for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE, > + MEMBLOCK_NONE, &start, &end, NULL) { > phdr->p_filesz = end - start; > phdr->p_type = PT_LOAD; > phdr->p_offset = start; > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index e6a23b3db696..d70c2835e913 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -142,7 +142,7 @@ void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start, > void __memblock_free_late(phys_addr_t base, phys_addr_t size); > > /** > - * for_each_mem_range - iterate through memblock areas from type_a and not > + * __for_each_mem_range - iterate through memblock areas from type_a and not > * included in type_b. Or just type_a if type_b is NULL. > * @i: u64 used as loop variable > * @type_a: ptr to memblock_type to iterate > @@ -153,7 +153,7 @@ void __memblock_free_late(phys_addr_t base, phys_addr_t size); > * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL > * @p_nid: ptr to int for nid of the range, can be %NULL > */ > -#define for_each_mem_range(i, type_a, type_b, nid, flags, \ > +#define __for_each_mem_range(i, type_a, type_b, nid, flags, \ > p_start, p_end, p_nid) \ > for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ > p_start, p_end, p_nid); \ > @@ -182,6 +182,16 @@ void __memblock_free_late(phys_addr_t base, phys_addr_t size); > __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ > p_start, p_end, p_nid)) > > +/** > + * for_each_mem_range - iterate through memory areas. > + * @i: u64 used as loop variable > + * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL > + * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL > + */ > +#define for_each_mem_range(i, p_start, p_end) \ > + __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, \ > + MEMBLOCK_NONE, p_start, p_end, NULL) > + > /** > * for_each_reserved_mem_region - iterate over all reserved memblock areas > * @i: u64 used as loop variable > @@ -287,8 +297,8 @@ int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask); > * soon as memblock is initialized. > */ > #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ > - for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ > - nid, flags, p_start, p_end, p_nid) > + __for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ > + nid, flags, p_start, p_end, p_nid) > > /** > * for_each_free_mem_range_reverse - rev-iterate through free memblock areas > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index e028b87ce294..95af111d69d3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -6972,8 +6972,7 @@ static void __init init_unavailable_mem(void) > * Loop through unavailable ranges not covered by memblock.memory. > */ > pgcnt = 0; > - for_each_mem_range(i, &memblock.memory, NULL, > - NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, NULL) { > + for_each_mem_range(i, &start, &end) { > if (next < start) > pgcnt += init_unavailable_range(PFN_DOWN(next), > PFN_UP(start)); > -- > 2.26.2 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel