diff options
| author | Juergen Gross <jgross@suse.com> | 2022-11-02 10:47:04 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-11-10 15:12:44 +0300 |
| commit | 7d71db537b01a6beadbe45a4e6e302272110c2c0 (patch) | |
| tree | cabf91f5054c2ee142f81bc4e5a6e1b61dd53158 /arch/x86/include/asm/mtrr.h | |
| parent | 23a63e369098a8503550d1df80f4b4801af32c19 (diff) | |
| download | linux-7d71db537b01a6beadbe45a4e6e302272110c2c0.tar.xz | |
x86/mtrr: Disentangle MTRR init from PAT init
Add a main cache_cpu_init() init routine which initializes MTRR and/or
PAT support depending on what has been detected on the system.
Leave the MTRR-specific initialization in a MTRR-specific init function
where the smp_changes_mask setting happens now with caches disabled.
This global mask update was done with caches enabled before probably
because atomic operations while running uncached might have been quite
expensive.
But since only systems with a broken BIOS should ever require to set any
bit in smp_changes_mask, hurting those devices with a penalty of a few
microseconds during boot shouldn't be a real issue.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20221102074713.21493-8-jgross@suse.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'arch/x86/include/asm/mtrr.h')
| -rw-r--r-- | arch/x86/include/asm/mtrr.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h index 12a16caed395..986249a2b9b6 100644 --- a/arch/x86/include/asm/mtrr.h +++ b/arch/x86/include/asm/mtrr.h @@ -50,6 +50,7 @@ extern int mtrr_trim_uncached_memory(unsigned long end_pfn); extern int amd_special_default_mtrr(void); void mtrr_disable(void); void mtrr_enable(void); +void mtrr_generic_set_state(void); # else static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform) { @@ -91,6 +92,7 @@ static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) #define mtrr_bp_restore() do {} while (0) #define mtrr_disable() do {} while (0) #define mtrr_enable() do {} while (0) +#define mtrr_generic_set_state() do {} while (0) # endif #ifdef CONFIG_COMPAT |