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x86/mce: Avoid unnecessary padding in struct mce_bank

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Convert struct mce_bank member "init" from bool to a bitfield to get rid
of unnecessary padding.

$ pahole -C mce_bank arch/x86/kernel/cpu/mce/core.o

before:

  /* size: 16, cachelines: 1, members: 2 */
  /* padding: 7 */
  /* last cacheline: 16 bytes */

after:

  /* size: 16, cachelines: 1, members: 3 */
  /* last cacheline: 16 bytes */

No functional changes.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220225193342.215780-2-Smita.KoralahalliChannabasappa@amd.com
This commit is contained in:
Smita Koralahalli
2022-02-25 13:33:40 -06:00
committed by Borislav Petkov
parent 3123109284
commit 9f1b19b977
1 changed files with 3 additions and 1 deletions
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arch/x86/kernel/cpu/mce/core.c
+3 -1
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@@ -69,7 +69,9 @@ DEFINE_PER_CPU_READ_MOSTLY(unsigned int, mce_num_banks);
struct mce_bank {
u64 ctl; /* subevents to enable */
bool init; /* initialise bank? */
__u64 init : 1, /* initialise bank? */
__reserved_1 : 63;
};
static DEFINE_PER_CPU_READ_MOSTLY(struct mce_bank[MAX_NR_BANKS], mce_banks_array);