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authorMike Rapoport <rppt@linux.vnet.ibm.com>2018-10-30 15:09:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-31 08:54:16 -0700
commit7e1c4e27928e5f87b9b1eaf06dc31773b2f1e7f1 (patch)
treed1fa2f4ef8d5e2c15c2db4b80f5782ca3d26db83 /init/main.c
parent530d4c0cfd5b71caf2d17f73a80696c4a4509813 (diff)
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memblock: stop using implicit alignment to SMP_CACHE_BYTES
When a memblock allocation APIs are called with align = 0, the alignment is implicitly set to SMP_CACHE_BYTES. Implicit alignment is done deep in the memblock allocator and it can come as a surprise. Not that such an alignment would be wrong even when used incorrectly but it is better to be explicit for the sake of clarity and the prinicple of the least surprise. Replace all such uses of memblock APIs with the 'align' parameter explicitly set to SMP_CACHE_BYTES and stop implicit alignment assignment in the memblock internal allocation functions. For the case when memblock APIs are used via helper functions, e.g. like iommu_arena_new_node() in Alpha, the helper functions were detected with Coccinelle's help and then manually examined and updated where appropriate. The direct memblock APIs users were updated using the semantic patch below: @@ expression size, min_addr, max_addr, nid; @@ ( | - memblock_alloc_try_nid_raw(size, 0, min_addr, max_addr, nid) + memblock_alloc_try_nid_raw(size, SMP_CACHE_BYTES, min_addr, max_addr, nid) | - memblock_alloc_try_nid_nopanic(size, 0, min_addr, max_addr, nid) + memblock_alloc_try_nid_nopanic(size, SMP_CACHE_BYTES, min_addr, max_addr, nid) | - memblock_alloc_try_nid(size, 0, min_addr, max_addr, nid) + memblock_alloc_try_nid(size, SMP_CACHE_BYTES, min_addr, max_addr, nid) | - memblock_alloc(size, 0) + memblock_alloc(size, SMP_CACHE_BYTES) | - memblock_alloc_raw(size, 0) + memblock_alloc_raw(size, SMP_CACHE_BYTES) | - memblock_alloc_from(size, 0, min_addr) + memblock_alloc_from(size, SMP_CACHE_BYTES, min_addr) | - memblock_alloc_nopanic(size, 0) + memblock_alloc_nopanic(size, SMP_CACHE_BYTES) | - memblock_alloc_low(size, 0) + memblock_alloc_low(size, SMP_CACHE_BYTES) | - memblock_alloc_low_nopanic(size, 0) + memblock_alloc_low_nopanic(size, SMP_CACHE_BYTES) | - memblock_alloc_from_nopanic(size, 0, min_addr) + memblock_alloc_from_nopanic(size, SMP_CACHE_BYTES, min_addr) | - memblock_alloc_node(size, 0, nid) + memblock_alloc_node(size, SMP_CACHE_BYTES, nid) ) [mhocko@suse.com: changelog update] [akpm@linux-foundation.org: coding-style fixes] [rppt@linux.ibm.com: fix missed uses of implicit alignment] Link: http://lkml.kernel.org/r/20181016133656.GA10925@rapoport-lnx Link: http://lkml.kernel.org/r/1538687224-17535-1-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Suggested-by: Michal Hocko <mhocko@suse.com> Acked-by: Paul Burton <paul.burton@mips.com> [MIPS] Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Acked-by: Michal Hocko <mhocko@suse.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Ingo Molnar <mingo@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/init/main.c b/init/main.c
index 51b8e7b8ae5b..ee147103ba1b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -375,10 +375,11 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
static void __init setup_command_line(char *command_line)
{
saved_command_line =
- memblock_alloc(strlen(boot_command_line) + 1, 0);
+ memblock_alloc(strlen(boot_command_line) + 1, SMP_CACHE_BYTES);
initcall_command_line =
- memblock_alloc(strlen(boot_command_line) + 1, 0);
- static_command_line = memblock_alloc(strlen(command_line) + 1, 0);
+ memblock_alloc(strlen(boot_command_line) + 1, SMP_CACHE_BYTES);
+ static_command_line = memblock_alloc(strlen(command_line) + 1,
+ SMP_CACHE_BYTES);
strcpy(saved_command_line, boot_command_line);
strcpy(static_command_line, command_line);
}
@@ -773,8 +774,10 @@ static int __init initcall_blacklist(char *str)
str_entry = strsep(&str, ",");
if (str_entry) {
pr_debug("blacklisting initcall %s\n", str_entry);
- entry = memblock_alloc(sizeof(*entry), 0);
- entry->buf = memblock_alloc(strlen(str_entry) + 1, 0);
+ entry = memblock_alloc(sizeof(*entry),
+ SMP_CACHE_BYTES);
+ entry->buf = memblock_alloc(strlen(str_entry) + 1,
+ SMP_CACHE_BYTES);
strcpy(entry->buf, str_entry);
list_add(&entry->next, &blacklisted_initcalls);
}