From: Peter Zijlstra <peterz@infradead.org>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: linux-next: Tree for Feb 7 (objtool warning)
Date: Mon, 10 Feb 2020 11:29:51 +0100 [thread overview]
Message-ID: <20200210102951.GD14879@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <cc2b942d-d29d-710c-a9f3-e762c76c3d06@infradead.org>
On Fri, Feb 07, 2020 at 08:17:25AM -0800, Randy Dunlap wrote:
> on x86_64:
>
> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool: i915_gem_execbuffer2_ioctl()+0x6c7: call to gen8_canonical_addr() with UACCESS enabled
> CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> CONFIG_64BIT=y
That's just really sad, stupid compiler.
Something like so I suppose...
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index 51b8718513bc..db6b75d4572f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -330,12 +330,12 @@
* canonical form [63:48] == [47]."
*/
#define GEN8_HIGH_ADDRESS_BIT 47
-static inline u64 gen8_canonical_addr(u64 address)
+static __always_inline u64 gen8_canonical_addr(u64 address)
{
return sign_extend64(address, GEN8_HIGH_ADDRESS_BIT);
}
-static inline u64 gen8_noncanonical_addr(u64 address)
+static __always_inline u64 gen8_noncanonical_addr(u64 address)
{
return address & GENMASK_ULL(GEN8_HIGH_ADDRESS_BIT, 0);
}
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 47f54b459c26..9acf654f0b19 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -162,7 +162,7 @@ static inline __u8 ror8(__u8 word, unsigned int shift)
*
* This is safe to use for 16- and 8-bit types as well.
*/
-static inline __s32 sign_extend32(__u32 value, int index)
+static __always_inline __s32 sign_extend32(__u32 value, int index)
{
__u8 shift = 31 - index;
return (__s32)(value << shift) >> shift;
@@ -173,7 +173,7 @@ static inline __s32 sign_extend32(__u32 value, int index)
* @value: value to sign extend
* @index: 0 based bit index (0<=index<64) to sign bit
*/
-static inline __s64 sign_extend64(__u64 value, int index)
+static __always_inline __s64 sign_extend64(__u64 value, int index)
{
__u8 shift = 63 - index;
return (__s64)(value << shift) >> shift;
next prev parent reply other threads:[~2020-02-10 10:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-07 0:59 linux-next: Tree for Feb 7 Stephen Rothwell
2020-02-07 16:17 ` linux-next: Tree for Feb 7 (objtool warning) Randy Dunlap
2020-02-10 10:29 ` Peter Zijlstra [this message]
2020-02-10 16:59 ` Randy Dunlap
2020-02-10 17:26 ` Josh Poimboeuf
2020-02-10 18:45 ` Josh Poimboeuf
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