Hi Dan,
Just a couple of minor things ...
Dan Williams <dan.j.williams@xxxxxxxxx> writes:
> In reaction to a proposal to introduce a memcpy_mcsafe_fast()
> implementation Linus points out that memcpy_mcsafe() is poorly named
> relative to communicating the scope of the interface. Specifically what
> addresses are valid to pass as source, destination, and what faults /
> exceptions are handled. Of particular concern is that even though x86
> might be able to handle the semantics of copy_mc_to_user() with its
> common copy_user_generic() implementation other archs likely need / want
> an explicit path for this case:
...
> diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
> index 0969285996cb..dcbbcbf3552c 100644
> --- a/arch/powerpc/include/asm/uaccess.h
> +++ b/arch/powerpc/include/asm/uaccess.h
> @@ -348,6 +348,32 @@ do { \
> extern unsigned long __copy_tofrom_user(void __user *to,
> const void __user *from, unsigned long size);
>
> +#ifdef CONFIG_ARCH_HAS_COPY_MC
> +extern unsigned long __must_check
We try not to add extern in headers anymore.
> +copy_mc_generic(void *to, const void *from, unsigned long size);
> +
> +static inline unsigned long __must_check
> +copy_mc_to_kernel(void *to, const void *from, unsigned long size)
> +{
> + return copy_mc_generic(to, from, size);
> +}
> +#define copy_mc_to_kernel copy_mc_to_kernel
> +
> +static inline unsigned long __must_check
> +copy_mc_to_user(void __user *to, const void *from, unsigned long n)
> +{
> + if (likely(check_copy_size(from, n, true))) {
> + if (access_ok(to, n)) {
> + allow_write_to_user(to, n);
> + n = copy_mc_generic((void *)to, from, n);
> + prevent_write_to_user(to, n);
> + }
> + }
> +
> + return n;
> +}
> +#endif
Otherwise that looks fine.
...
> diff --git a/tools/testing/selftests/powerpc/copyloops/Makefile b/tools/testing/selftests/powerpc/copyloops/Makefile
> index 0917983a1c78..959817e7567c 100644
> --- a/tools/testing/selftests/powerpc/copyloops/Makefile
> +++ b/tools/testing/selftests/powerpc/copyloops/Makefile
> @@ -45,9 +45,9 @@ $(OUTPUT)/memcpy_p7_t%: memcpy_power7.S $(EXTRA_SOURCES)
> -D SELFTEST_CASE=$(subst memcpy_p7_t,,$(notdir $@)) \
> -o $@ $^
>
> -$(OUTPUT)/memcpy_mcsafe_64: memcpy_mcsafe_64.S $(EXTRA_SOURCES)
> +$(OUTPUT)/copy_mc: copy_mc.S $(EXTRA_SOURCES)
> $(CC) $(CPPFLAGS) $(CFLAGS) \
> - -D COPY_LOOP=test_memcpy_mcsafe \
> + -D COPY_LOOP=test_copy_mc \
This needs a fixup:
diff --git a/tools/testing/selftests/powerpc/copyloops/Makefile b/tools/testing/selftests/powerpc/copyloops/Makefile
index 959817e7567c..b4eb5c4c6858 100644
--- a/tools/testing/selftests/powerpc/copyloops/Makefile
+++ b/tools/testing/selftests/powerpc/copyloops/Makefile
@@ -47,7 +47,7 @@ $(OUTPUT)/memcpy_p7_t%: memcpy_power7.S $(EXTRA_SOURCES)
$(OUTPUT)/copy_mc: copy_mc.S $(EXTRA_SOURCES)
$(CC) $(CPPFLAGS) $(CFLAGS) \
- -D COPY_LOOP=test_copy_mc \
+ -D COPY_LOOP=test_copy_mc_generic \
-o $@ $^
$(OUTPUT)/copyuser_64_exc_t%: copyuser_64.S exc_validate.c ../harness.c \
> -o $@ $^
>
> $(OUTPUT)/copyuser_64_exc_t%: copyuser_64.S exc_validate.c ../harness.c \
> diff --git a/tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S b/tools/testing/selftests/powerpc/copyloops/copy_mc.S
> similarity index 100%
> rename from tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S
> rename to tools/testing/selftests/powerpc/copyloops/copy_mc.S
This file is a symlink to the file in arch/powerpc/lib, so the name of
the link needs updating, as well as the target.
Also is there a reason you dropped the "_64"? It would make most sense
to keep it I think, as then the file in selftests and the file in arch/
have the same name.
If you want to keep the copy_mc.S name it needs the diff below. Though
as I said I think it would be better to use copy_mc_64.S.
cheers
diff --git a/tools/testing/selftests/powerpc/copyloops/copy_mc.S b/tools/testing/selftests/powerpc/copyloops/copy_mc.S
new file mode 120000
index 000000000000..dcbe06d500fb
--- /dev/null
+++ b/tools/testing/selftests/powerpc/copyloops/copy_mc.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/copy_mc_64.S
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S b/tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S
deleted file mode 120000
index f0feef3062f6..000000000000
--- a/tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S
+++ /dev/null
@@ -1 +0,0 @@
-../../../../../arch/powerpc/lib/memcpy_mcsafe_64.S
\ No newline at end of file
--
2.25.1
