search for: __chk_io_ptr

...gt; > extern __visible const void __nosave_begin, __nosave_end; > > diff --git a/include/linux/compiler.h b/include/linux/compiler.h > index e95a2631e545..6997716f73bf 100644 > --- a/include/linux/compiler.h > +++ b/include/linux/compiler.h > @@ -78,6 +78,14 @@ extern void __chk_io_ptr(const volatile void __iomem *); > #include <linux/compiler-clang.h> > #endif > > +/* Useful for Position Independent Code to reduce global references */ > +#ifdef CONFIG_DEFAULT_HIDDEN > +#pragma GCC visibility push(hidden) > +#define __default_visibility __attribute...

...gt; > extern __visible const void __nosave_begin, __nosave_end; > > diff --git a/include/linux/compiler.h b/include/linux/compiler.h > index e95a2631e545..6997716f73bf 100644 > --- a/include/linux/compiler.h > +++ b/include/linux/compiler.h > @@ -78,6 +78,14 @@ extern void __chk_io_ptr(const volatile void __iomem *); > #include <linux/compiler-clang.h> > #endif > > +/* Useful for Position Independent Code to reduce global references */ > +#ifdef CONFIG_DEFAULT_HIDDEN > +#pragma GCC visibility push(hidden) > +#define __default_visibility __attribute...

...return *(const volatile u32 __force *)addr; > } SuperH is another example: 1. ioread8_rep(void __iomem *addr, void *dst, unsigned long count) calls mmio_insb() 2. static inline void mmio_insb(void __iomem *addr, u8 *dst, int count) calls __raw_readb() 3. #define __raw_readb(a) (__chk_io_ptr(a), *(volatile u8 __force *)(a)) Even if interface was not marked as volatile, in fact its implementation was casting to volatile. > The __force-cast that removes the __iomem here also means that > the 'volatile' keyword could be dropped from the argument list, > as it has no re...

...isible const void __nosave_begin, __nosave_end; >> >> diff --git a/include/linux/compiler.h b/include/linux/compiler.h >> index e95a2631e545..6997716f73bf 100644 >> --- a/include/linux/compiler.h >> +++ b/include/linux/compiler.h >> @@ -78,6 +78,14 @@ extern void __chk_io_ptr(const volatile void __iomem *); >> #include <linux/compiler-clang.h> >> #endif >> >> +/* Useful for Position Independent Code to reduce global references */ >> +#ifdef CONFIG_DEFAULT_HIDDEN >> +#pragma GCC visibility push(hidden) >> +#define __defau...

...EN +#pragma GCC visibility pop +#endif extern __visible const void __nosave_begin, __nosave_end; diff --git a/include/linux/compiler.h b/include/linux/compiler.h index e95a2631e545..6997716f73bf 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -78,6 +78,14 @@ extern void __chk_io_ptr(const volatile void __iomem *); #include <linux/compiler-clang.h> #endif +/* Useful for Position Independent Code to reduce global references */ +#ifdef CONFIG_DEFAULT_HIDDEN +#pragma GCC visibility push(hidden) +#define __default_visibility __attribute__((visibility ("default"...

Le 08/01/2020 ? 09:18, Krzysztof Kozlowski a ?crit?: > On Wed, 8 Jan 2020 at 09:13, Geert Uytterhoeven <geert at linux-m68k.org> wrote: >> >> Hi Krzysztof, >> >> On Wed, Jan 8, 2020 at 9:07 AM Geert Uytterhoeven <geert at linux-m68k.org> wrote: >>> On Tue, Jan 7, 2020 at 5:53 PM Krzysztof Kozlowski <krzk at kernel.org> wrote: >>>>

Changes: - patch v1: - Simplify ftrace implementation. - Use gcc mstack-protector-guard-reg=%gs with PIE when possible. - rfc v3: - Use --emit-relocs instead of -pie to reduce dynamic relocation space on mapped memory. It also simplifies the relocation process. - Move the start the module section next to the kernel. Remove the need for -mcmodel=large on modules. Extends

Changes: - patch v1: - Simplify ftrace implementation. - Use gcc mstack-protector-guard-reg=%gs with PIE when possible. - rfc v3: - Use --emit-relocs instead of -pie to reduce dynamic relocation space on mapped memory. It also simplifies the relocation process. - Move the start the module section next to the kernel. Remove the need for -mcmodel=large on modules. Extends

These patches make the changes necessary to build the kernel as Position Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below the top 2G of the virtual address space. It allows to optionally extend the KASLR randomization range from 1G to 3G. Thanks a lot to Ard Biesheuvel & Kees Cook on their feedback on compiler changes, PIE support and KASLR in general. Thanks to

These patches make the changes necessary to build the kernel as Position Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below the top 2G of the virtual address space. It allows to optionally extend the KASLR randomization range from 1G to 3G. Thanks a lot to Ard Biesheuvel & Kees Cook on their feedback on compiler changes, PIE support and KASLR in general. Thanks to