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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-12-20 18:02:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-12-22 20:13:00 +0100 |
| commit | 7bbcbd3d1cdcbacd0f9f8dc4c98d550972f1ca30 (patch) | |
| tree | 6c2316f44bbe075a1a0c764554cd7df41ec562f5 | |
| parent | 6cbd2171e89b13377261d15e64384df60ecb530e (diff) | |
| download | linux-7bbcbd3d1cdcbacd0f9f8dc4c98d550972f1ca30.tar.gz linux-7bbcbd3d1cdcbacd0f9f8dc4c98d550972f1ca30.tar.bz2 linux-7bbcbd3d1cdcbacd0f9f8dc4c98d550972f1ca30.zip | |
x86/Kconfig: Limit NR_CPUS on 32-bit to a sane amount
The recent cpu_entry_area changes fail to compile on 32-bit when BIGSMP=y
and NR_CPUS=512, because the fixmap area becomes too big.
Limit the number of CPUs with BIGSMP to 64, which is already way to big for
32-bit, but it's at least a working limitation.
We performed a quick survey of 32-bit-only machines that might be affected
by this change negatively, but found none.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/Kconfig | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 665eba1b6103..cd5199de231e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -925,7 +925,8 @@ config MAXSMP config NR_CPUS int "Maximum number of CPUs" if SMP && !MAXSMP range 2 8 if SMP && X86_32 && !X86_BIGSMP - range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK + range 2 64 if SMP && X86_32 && X86_BIGSMP + range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK && X86_64 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64 default "1" if !SMP default "8192" if MAXSMP |