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x86/split_lock: Remove dead string when split_lock_detect=fatal

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sld_state_show() has a dead str1 below:

  if (A) {
  	...
  } else if (B) {
  	pr_info(... A ? str1 : str2 ...);
  }

where A is always false in the second block, implied by the "if (A) else"
pattern. Hence, str2 is always used.

This seems to be some mysterious legacy inherited from the earlier patch
revisions of

  ebb1064e7c ("x86/traps: Handle #DB for bus lock").

Earlier revisions¹ did enable both sld and bld at the same time to detect
non-WB bus_locks when split_lock_detect=fatal, but that's no longer true in
the merged revision.

Remove it and translate the pr_info() into its equivalent form.

¹ https://lore.kernel.org/r/20201121023624.3604415-3-fenghua.yu@intel.com

  [ bp: Massage commit message; simplify braces ]

Signed-off-by: Rong Zhang <i@rong.moe>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20251215182907.152881-1-i@rong.moe
This commit is contained in:
Rong Zhang
2025-12-16 02:11:51 +08:00
committed by Borislav Petkov (AMD)
parent f8f9c1f4d0
commit 6823f10dcc
1 changed files with 3 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/kernel/cpu/bus_lock.c
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@@ -410,13 +410,10 @@ static void sld_state_show(void)
}
break;
case sld_fatal:
if (boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT)) {
if (boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT))
pr_info("#AC: crashing the kernel on kernel split_locks and sending SIGBUS on user-space split_locks\n");
} else if (boot_cpu_has(X86_FEATURE_BUS_LOCK_DETECT)) {
pr_info("#DB: sending SIGBUS on user-space bus_locks%s\n",
boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT) ?
" from non-WB" : "");
}
else if (boot_cpu_has(X86_FEATURE_BUS_LOCK_DETECT))
pr_info("#DB: sending SIGBUS on user-space bus_locks\n");
break;
case sld_ratelimit:
if (boot_cpu_has(X86_FEATURE_BUS_LOCK_DETECT))