On Sun, Jun 26, 2022 at 7:42 AM Masahiro Yamada wrote:
>
> The .incbin assembler directive is much faster than bin2c + $(CC).
>
> Do similar refactoring as in commit 4c0f032d4963 ("s390/purgatory:
> Omit use of bin2c").
>
> Please note the .quad directive matches to size_t in C (both 8 byte)
> bec
From: Jianli Wang
Delete the redundant word 'do'.
Signed-off-by: Jianli Wang
---
arch/powerpc/kvm/book3s_hv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index e08fb3124dca..17d79be6077d 100644
--- a/arch/power
Signed-off-by: wangjianli
---
arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 514fd45c1994..73c6db20cd8a 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/
Delete the redundant word 'so'.
Signed-off-by: wangjianli
---
arch/powerpc/mm/init-common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index 119ef491f797..acf5d7ba79d1 100644
--- a/arch/powerpc/mm/init-common
On Sun, Jun 26, 2022 at 07:40:37AM +0900, Masahiro Yamada wrote:
> The .incbin assembler directive is much faster than bin2c + $(CC).
And perhaps more importantly it is simpler and less clumsy.
> --- /dev/null
> +++ b/arch/powerpc/purgatory/kexec-purgatory.S
> @@ -0,0 +1,14 @@
> +/* SPDX-License-
On Sun, Jul 24, 2022 at 01:41:37PM +0800, wangjianli wrote:
> From: Jianli Wang
>
> Delete the redundant word 'do'.
> - /* invalidate the entry (what do do on error from the above ?) */
> + /* invalidate the entry (what do on error from the above ?) */
Probably "what to do" was meant he
On Sun, Jul 24, 2022 at 02:36:22PM +0800, wangjianli wrote:
> Delete the redundant word 'so'.
> /* It would be nice if this was a BUILD_BUG_ON(), but at the
>* moment, gcc doesn't seem to recognize is_power_of_2 as a
> - * constant expression, so so much for that. */
> + *
The .incbin assembler directive is much faster than bin2c + $(CC).
Do similar refactoring as in commit 4c0f032d4963 ("s390/purgatory:
Omit use of bin2c").
Please note the .quad directive matches to size_t in C (both 8 byte)
because the purgatory is compiled only for the 64-bit kernel.
(KEXEC_FILE
On Mon, Jul 25, 2022 at 10:42 AM Segher Boessenkool
wrote:
>
> On Sun, Jun 26, 2022 at 07:40:37AM +0900, Masahiro Yamada wrote:
> > The .incbin assembler directive is much faster than bin2c + $(CC).
>
> And perhaps more importantly it is simpler and less clumsy.
>
> > --- /dev/null
> > +++ b/arch/
Segher Boessenkool writes:
> On Sat, Jul 23, 2022 at 03:34:05PM +0200, Michal Suchánek wrote:
>> Hello,
>>
>> On Sat, Jul 23, 2022 at 05:24:36PM +0800, Jason Wang wrote:
>> > Initialise global and static variable to 0 is always unnecessary.
>> > Remove the unnecessary initialisations.
>>
>> Isn'
V1 available here:
Link: https://lore.kernel.org/all/20220601054850.250287-1-rmcl...@linux.ibm.com/
Implement a syscall wrapper, causing arguments to handlers to be passed
via a struct pt_regs on the stack. The syscall wrapper is implemented
for all platforms other than the Cell processor, from w
Arch-specific implementations of syscall handlers are currently used
over generic implementations for the following reasons:
1. Semantics unique to powerpc
2. Compatibility syscalls require 'argument padding' to comply with
64-bit argument convention in ELF32 abi.
3. Parameter types or orde
Syscall handlers should not be invoked internally by their symbol names,
as these symbols defined by the architecture-defined SYSCALL_DEFINE
macro. Fortunately, in the case of ppc64_personality, its call to
sys_personality can be replaced with an invocation to the
equivalent ksys_personality inline
Syscall handlers should not be invoked internally by their symbol names,
as these symbols defined by the architecture-defined SYSCALL_DEFINE
macro. Move the compatibility syscall definition for mmap2 to
syscalls.c, so that all mmap implementations can share an inline helper
function, as is done wit
Syscall #82 has been implemented for 32-bit platforms in a unique way on
powerpc systems. This hack will in effect guess whether the caller is
expecting new select semantics or old select semantics. It does so via a
guess, based off the first parameter. In new select, this parameter
represents the
The powerpc fallocate compat syscall handler is identical to the
generic implementation provided by commit 59c10c52f573f ("riscv:
compat: syscall: Add compat_sys_call_table implementation"), and as
such can be removed in favour of the generic implementation.
A future patch series will replace more
Forward declare all syscall handler prototypes where a generic prototype
is not provided in either linux/syscalls.h or linux/compat.h in
asm/syscalls.h. This is required for compile-time type-checking for
syscall handlers, which is implemented later in this series.
32-bit compatibility syscall han
The table of syscall handlers and registered compatibility syscall
handlers has in past been produced using assembly, with function
references resolved at link time. This moves link-time errors to
compile-time, by rewriting systbl.S in C, and including the
linux/syscalls.h, linux/compat.h and asm/s
Cause syscall handlers to be typed as follows when called indirectly
throughout the kernel.
typedef long (*syscall_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long);
Since both 32 and 64-bit abis allow for at least the first s
Macros for restoring and saving registers to and from the stack exist.
Provide macros with the same interface for clearing a range of gprs by
setting each register's value in that range to zero.
The resulting macros are called NULLIFY_GPRS and NULLIFY_NVGPRS, keeping
with the naming of the accompa
Implement syscall wrapper as per s390, x86, arm64. When enabled
cause handlers to accept parameters from a stack frame rather than
from user scratch register state. This allows for user registers to be
safely cleared in order to reduce caller influence on speculation
within syscall routine. The wra
Clear user state in gprs (assign to zero) to reduce the influence of user
registers on speculation within kernel syscall handlers. Clears occur
at the very beginning of the sc and scv 0 interrupt handlers, with
restores occurring following the execution of the syscall handler.
One function of sysc
Use the convenience macros for saving/clearing/restoring gprs in keeping
with syscall calling conventions. The plural variants of these macros
can store a range of registers for concision.
This works well when the save-to-stack logic is simple (a gpr is saved
to its corresponding offset in the str
Interrupt handlers on 64s systems will often need to save register state
from the interrupted process to make space for loading special purpose
registers or for internal state.
Fix a comment documenting a common code path macro in the beginning of
interrupt handlers where r10 is saved to the PACA
Zero GPRS r0, r2-r11, r14-r31, on entry into the kernel for all
other interrupt sources to limit influence of user-space values
in potential speculation gadgets. The remaining gprs are overwritten by
entry macros to interrupt handlers, irrespective of whether or not a
given handler consumes these r
wangjianli writes:
> Signed-off-by: wangjianli
> ---
> arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> index 514fd45c1994..73c6db20cd8a 100644
> --- a/arch/
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