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| author | Peter Zijlstra <peterz@infradead.org> | 2018-09-19 11:50:22 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-09-27 21:39:42 +0300 |
| commit | fce2ce9544e9f098ba828442221ce99c2a5ecb0f (patch) | |
| tree | fedc1986407d0a35a6312b0b237135f2b2c6e273 /arch/x86/mm/pageattr.c | |
| parent | 5f464b33b17219a233af1267c621632225bc7acc (diff) | |
| download | linux-fce2ce9544e9f098ba828442221ce99c2a5ecb0f.tar.xz | |
x86/mm/cpa: Move CLFLUSH test into cpa_flush_array()
Rather than guarding cpa_flush_array() users with a CLFLUSH test, put
it inside.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Bin Yang <bin.yang@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Link: https://lkml.kernel.org/r/20180919085948.087848187@infradead.org
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 3cc4a2ae4dbb..33d89d505f93 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -328,6 +328,11 @@ static void cpa_flush_array(unsigned long baddr, unsigned long *start, BUG_ON(irqs_disabled() && !early_boot_irqs_disabled); + if (!static_cpu_has(X86_FEATURE_CLFLUSH)) { + cpa_flush_all(cache); + return; + } + flush_tlb_kernel_range(baddr, baddr + PAGE_SIZE * numpages); if (!cache) @@ -1756,19 +1761,19 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages, cache = !!pgprot2cachemode(mask_set); /* - * On success we use CLFLUSH, when the CPU supports it to - * avoid the WBINVD. If the CPU does not support it and in the - * error case we fall back to cpa_flush_all (which uses - * WBINVD): + * On error; flush everything to be sure. */ - if (!ret && boot_cpu_has(X86_FEATURE_CLFLUSH)) { - if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) { - cpa_flush_array(baddr, addr, numpages, cache, - cpa.flags, pages); - } else - cpa_flush_range(baddr, numpages, cache); - } else + if (ret) { cpa_flush_all(cache); + goto out; + } + + if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) { + cpa_flush_array(baddr, addr, numpages, cache, + cpa.flags, pages); + } else { + cpa_flush_range(baddr, numpages, cache); + } out: return ret; |