Re: [RFC 5/8] x86: refcount: prevent gcc distortions

>>> On 16.05.18 at 18:44, wrote: > Jan Beulich wrote: > On 15.05.18 at 16:11, wrote: >>> --- a/arch/x86/include/asm/refcount.h >>> +++ b/arch/x86/include/asm/refcount.h >>> @@ -14,34 +14,43 @@ >>> * central refcount exception. The

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

>>> On 16.05.18 at 18:44, wrote: > Jan Beulich wrote: > On 15.05.18 at 16:11, wrote: >>> --- a/arch/x86/include/asm/refcount.h >>> +++ b/arch/x86/include/asm/refcount.h >>> @@ -14,34 +14,43 @@ >>> * central refcount exception. The fixup address for the exception points >>> * back to the

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

Jan Beulich wrote: On 15.05.18 at 16:11, wrote: >> --- a/arch/x86/include/asm/refcount.h >> +++ b/arch/x86/include/asm/refcount.h >> @@ -14,34 +14,43 @@ >> * central refcount exception. The fixup address for the exception points >> * back to the

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

Jan Beulich wrote: On 15.05.18 at 16:11, wrote: >> --- a/arch/x86/include/asm/refcount.h >> +++ b/arch/x86/include/asm/refcount.h >> @@ -14,34 +14,43 @@ >> * central refcount exception. The fixup address for the exception points >> * back to the regular execution flow in .text. >> */ >>

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

Kees Cook wrote: > On Tue, May 15, 2018 at 7:11 AM, Nadav Amit wrote: >> GCC considers the number of statements in inlined assembly blocks, >> according to new-lines and semicolons, as an indication to the cost of >> the block in time and space. This

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

Kees Cook wrote: > On Tue, May 15, 2018 at 7:11 AM, Nadav Amit wrote: >> GCC considers the number of statements in inlined assembly blocks, >> according to new-lines and semicolons, as an indication to the cost of >> the block in time and space. This data is distorted by the kernel code, >>

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

On Tue, May 15, 2018 at 7:11 AM, Nadav Amit wrote: > GCC considers the number of statements in inlined assembly blocks, > according to new-lines and semicolons, as an indication to the cost of > the block in time and space. This data is distorted by the kernel code, > which puts

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

On Tue, May 15, 2018 at 7:11 AM, Nadav Amit wrote: > GCC considers the number of statements in inlined assembly blocks, > according to new-lines and semicolons, as an indication to the cost of > the block in time and space. This data is distorted by the kernel code, > which puts information in

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

>>> On 15.05.18 at 16:11, wrote: > --- a/arch/x86/include/asm/refcount.h > +++ b/arch/x86/include/asm/refcount.h > @@ -14,34 +14,43 @@ > * central refcount exception. The fixup address for the exception points > * back to the regular execution flow in .text. > */ >

Re: [RFC 5/8] x86: refcount: prevent gcc distortions

>>> On 15.05.18 at 16:11, wrote: > --- a/arch/x86/include/asm/refcount.h > +++ b/arch/x86/include/asm/refcount.h > @@ -14,34 +14,43 @@ > * central refcount exception. The fixup address for the exception points > * back to the regular execution flow in .text. > */ > -#define

[RFC 5/8] x86: refcount: prevent gcc distortions

GCC considers the number of statements in inlined assembly blocks, according to new-lines and semicolons, as an indication to the cost of the block in time and space. This data is distorted by the kernel code, which puts information in alternative sections. As a result, the compiler may perform

[RFC 5/8] x86: refcount: prevent gcc distortions

GCC considers the number of statements in inlined assembly blocks, according to new-lines and semicolons, as an indication to the cost of the block in time and space. This data is distorted by the kernel code, which puts information in alternative sections. As a result, the compiler may perform

[RFC 5/8] x86: refcount: prevent gcc distortions

GCC considers the number of statements in inlined assembly blocks, according to new-lines and semicolons, as an indication to the cost of the block in time and space. This data is distorted by the kernel code, which puts information in alternative sections. As a result, the compiler may perform

[RFC 5/8] x86: refcount: prevent gcc distortions

GCC considers the number of statements in inlined assembly blocks, according to new-lines and semicolons, as an indication to the cost of the block in time and space. This data is distorted by the kernel code, which puts information in alternative sections. As a result, the compiler may perform