Messages in this thread Patch in this message | | | From | jun.zhang@intel ... | Subject | [PATCH] x86/PAT: priority the PAT warn to error to highlight the developer | Date | Sun, 29 Sep 2019 15:20:31 +0800 |
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From: zhang jun <jun.zhang@intel.com>
Documentation/x86/pat.txt says: set_memory_uc() or set_memory_wc() must use together with set_memory_wb()
if break the PAT attribute, there are tons of warning like: [ 45.846872] x86/PAT: NDK MediaCodec_:3753 map pfn RAM range req write-combining for [mem 0x1e7a80000-0x1e7a87fff], got write-back and in the extremely case, we see kernel panic unexpected like: list_del corruption. prev->next should be ffff88806dbe69c0, but was ffff888036f048c0
so it's better to priority the warn to error to highlight to remind the developer.
Signed-off-by: zhang jun <jun.zhang@intel.com> Signed-off-by: he, bo <bo.he@intel.com> --- arch/x86/mm/pat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index d9fbd4f69920..43a4dfdcedc8 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -897,7 +897,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot, pcm = lookup_memtype(paddr); if (want_pcm != pcm) { - pr_warn("x86/PAT: %s:%d map pfn RAM range req %s for [mem %#010Lx-%#010Lx], got %s\n", + pr_err("x86/PAT: %s:%d map pfn RAM range req %s for [mem %#010Lx-%#010Lx], got %s!!!\n", current->comm, current->pid, cattr_name(want_pcm), (unsigned long long)paddr, -- 2.17.1
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