From: David Hildenbrand <david@xxxxxxxxxx> Subject: proc/vmcore: let pfn_is_ram() return a bool The callback should deal with errors internally, it doesn't make sense to expose these via pfn_is_ram(). We'll rework the callbacks next. Right now we consider errors as if "it's RAM"; no functional change. Link: https://lkml.kernel.org/r/20211005121430.30136-5-david@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Cc: Dave Young <dyoung@xxxxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: Juergen Gross <jgross@xxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Mike Rapoport <rppt@xxxxxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxx> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Vivek Goyal <vgoyal@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/vmcore.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/fs/proc/vmcore.c~proc-vmcore-let-pfn_is_ram-return-a-bool +++ a/fs/proc/vmcore.c @@ -84,11 +84,11 @@ void unregister_oldmem_pfn_is_ram(void) } EXPORT_SYMBOL_GPL(unregister_oldmem_pfn_is_ram); -static int pfn_is_ram(unsigned long pfn) +static bool pfn_is_ram(unsigned long pfn) { int (*fn)(unsigned long pfn); /* pfn is ram unless fn() checks pagetype */ - int ret = 1; + bool ret = true; /* * Ask hypervisor if the pfn is really ram. @@ -97,7 +97,7 @@ static int pfn_is_ram(unsigned long pfn) */ fn = oldmem_pfn_is_ram; if (fn) - ret = fn(pfn); + ret = !!fn(pfn); return ret; } @@ -124,7 +124,7 @@ ssize_t read_from_oldmem(char *buf, size nr_bytes = count; /* If pfn is not ram, return zeros for sparse dump files */ - if (pfn_is_ram(pfn) == 0) + if (!pfn_is_ram(pfn)) memset(buf, 0, nr_bytes); else { if (encrypted) _
