| Message ID | 20201009195033.3208459-52-ira.weiny@intel.com (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
| Series | PMEM: Introduce stray write protection for PMEM | expand |
ira.weiny@intel.com writes: > From: Ira Weiny <ira.weiny@intel.com> > > This kmap() call is localized to a single thread. To avoid the over > head of global PKRS updates use the new kmap_thread() call. Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> > > Cc: Eric Biederman <ebiederm@xmission.com> > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > --- > kernel/kexec_core.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c > index c19c0dad1ebe..272a9920c0d6 100644 > --- a/kernel/kexec_core.c > +++ b/kernel/kexec_core.c > @@ -815,7 +815,7 @@ static int kimage_load_normal_segment(struct kimage *image, > if (result < 0) > goto out; > > - ptr = kmap(page); > + ptr = kmap_thread(page); > /* Start with a clear page */ > clear_page(ptr); > ptr += maddr & ~PAGE_MASK; > @@ -828,7 +828,7 @@ static int kimage_load_normal_segment(struct kimage *image, > memcpy(ptr, kbuf, uchunk); > else > result = copy_from_user(ptr, buf, uchunk); > - kunmap(page); > + kunmap_thread(page); > if (result) { > result = -EFAULT; > goto out; > @@ -879,7 +879,7 @@ static int kimage_load_crash_segment(struct kimage *image, > goto out; > } > arch_kexec_post_alloc_pages(page_address(page), 1, 0); > - ptr = kmap(page); > + ptr = kmap_thread(page); > ptr += maddr & ~PAGE_MASK; > mchunk = min_t(size_t, mbytes, > PAGE_SIZE - (maddr & ~PAGE_MASK)); > @@ -895,7 +895,7 @@ static int kimage_load_crash_segment(struct kimage *image, > else > result = copy_from_user(ptr, buf, uchunk); > kexec_flush_icache_page(page); > - kunmap(page); > + kunmap_thread(page); > arch_kexec_pre_free_pages(page_address(page), 1); > if (result) { > result = -EFAULT;
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index c19c0dad1ebe..272a9920c0d6 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -815,7 +815,7 @@ static int kimage_load_normal_segment(struct kimage *image, if (result < 0) goto out; - ptr = kmap(page); + ptr = kmap_thread(page); /* Start with a clear page */ clear_page(ptr); ptr += maddr & ~PAGE_MASK; @@ -828,7 +828,7 @@ static int kimage_load_normal_segment(struct kimage *image, memcpy(ptr, kbuf, uchunk); else result = copy_from_user(ptr, buf, uchunk); - kunmap(page); + kunmap_thread(page); if (result) { result = -EFAULT; goto out; @@ -879,7 +879,7 @@ static int kimage_load_crash_segment(struct kimage *image, goto out; } arch_kexec_post_alloc_pages(page_address(page), 1, 0); - ptr = kmap(page); + ptr = kmap_thread(page); ptr += maddr & ~PAGE_MASK; mchunk = min_t(size_t, mbytes, PAGE_SIZE - (maddr & ~PAGE_MASK)); @@ -895,7 +895,7 @@ static int kimage_load_crash_segment(struct kimage *image, else result = copy_from_user(ptr, buf, uchunk); kexec_flush_icache_page(page); - kunmap(page); + kunmap_thread(page); arch_kexec_pre_free_pages(page_address(page), 1); if (result) { result = -EFAULT;