On Thu, Apr 28, 2016 at 2:58 PM, Russell King
<rmk+kernel@xxxxxxxxxxxxxxxx> wrote:
> On PAE systems (eg, ARM LPAE) the vmcore note may be located above
> 4GB physical on 32-bit architectures, so we need a wider type than
> "unsigned long" here. Arrange for paddr_vmcoreinfo_note() to return
> a phys_addr_t, thereby allowing it to be located above 4GB.
>
> This makes no difference for kexec-tools, as they already assume a
> 64-bit type when reading from this file.
>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> ---
> arch/ia64/kernel/machine_kexec.c | 2 +-
> include/linux/kexec.h | 2 +-
> kernel/kexec_core.c | 2 +-
> kernel/ksysfs.c | 4 ++--
> 4 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c
> index b72cd7a07222..599507bcec91 100644
> --- a/arch/ia64/kernel/machine_kexec.c
> +++ b/arch/ia64/kernel/machine_kexec.c
> @@ -163,7 +163,7 @@ void arch_crash_save_vmcoreinfo(void)
> #endif
> }
>
> -unsigned long paddr_vmcoreinfo_note(void)
> +phys_addr_t paddr_vmcoreinfo_note(void)
> {
> return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
> }
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index 1b32ab587f66..52a3a221bcb2 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -235,7 +235,7 @@ void crash_unmap_reserved_pages(void);
> void arch_crash_save_vmcoreinfo(void);
> __printf(1, 2)
> void vmcoreinfo_append_str(const char *fmt, ...);
> -unsigned long paddr_vmcoreinfo_note(void);
> +phys_addr_t paddr_vmcoreinfo_note(void);
>
> #define VMCOREINFO_OSRELEASE(value) \
> vmcoreinfo_append_str("OSRELEASE=%s\n", value)
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index d719a4d0ef55..f9847e5822e6 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -1377,7 +1377,7 @@ void vmcoreinfo_append_str(const char *fmt, ...)
> void __weak arch_crash_save_vmcoreinfo(void)
> {}
>
> -unsigned long __weak paddr_vmcoreinfo_note(void)
> +phys_addr_t __weak paddr_vmcoreinfo_note(void)
> {
> return __pa((unsigned long)(char *)&vmcoreinfo_note);
> }
> diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
> index 152da4a48867..9f1920d2d0c6 100644
> --- a/kernel/ksysfs.c
> +++ b/kernel/ksysfs.c
> @@ -128,8 +128,8 @@ KERNEL_ATTR_RW(kexec_crash_size);
> static ssize_t vmcoreinfo_show(struct kobject *kobj,
> struct kobj_attribute *attr, char *buf)
> {
> - return sprintf(buf, "%lx %x\n",
> - paddr_vmcoreinfo_note(),
> + phys_addr_t vmcore_base = paddr_vmcoreinfo_note();
> + return sprintf(buf, "%pa %x\n", &vmcore_base,
Why do we pass &vmcore_base? Shouldn't it be vmcore_base?
~Pratyush
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