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| author | Philipp Rudo <prudo@linux.ibm.com> | 2018-08-13 12:45:06 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2018-08-16 14:49:15 +0200 |
| commit | 28b7465376b9f9633bb774e45c0421dc4db7f303 (patch) | |
| tree | 272f390e448080aba50b7194bc011359fea77568 /arch/s390/kernel | |
| parent | s390/kdump: Fix memleak in nt_vmcoreinfo (diff) | |
| download | linux-28b7465376b9f9633bb774e45c0421dc4db7f303.tar.xz linux-28b7465376b9f9633bb774e45c0421dc4db7f303.zip | |
s390/kdump: Remove kzalloc_panic
For this function there are only two users, when 1) the elfcorehdr and 2)
the vmcoreinfo is allocated. However a missing vmcoreinfo is not critical
for kdump. So panicking when it cannot be allocated is not required.
Remove kzalloc_panic and adjust its callers accordingly.
Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/crash_dump.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index 27d2b7093ea0..376f6b6dfb3c 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -293,19 +293,6 @@ int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, prot); } -/* - * Alloc memory and panic in case of ENOMEM - */ -static void *kzalloc_panic(int len) -{ - void *rc; - - rc = kzalloc(len, GFP_KERNEL); - if (!rc) - panic("s390 kdump kzalloc (%d) failed", len); - return rc; -} - static const char *nt_name(Elf64_Word type) { const char *name = "LINUX"; @@ -453,7 +440,9 @@ static void *get_vmcoreinfo_old(unsigned long *size) return NULL; if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0) return NULL; - vmcoreinfo = kzalloc_panic(note.n_descsz); + vmcoreinfo = kzalloc(note.n_descsz, GFP_KERNEL); + if (!vmcoreinfo) + return NULL; if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) { kfree(vmcoreinfo); return NULL; @@ -661,7 +650,15 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) alloc_size = get_elfcorehdr_size(mem_chunk_cnt); - hdr = kzalloc_panic(alloc_size); + hdr = kzalloc(alloc_size, GFP_KERNEL); + + /* Without elfcorehdr /proc/vmcore cannot be created. Thus creating + * a dump with this crash kernel will fail. Panic now to allow other + * dump mechanisms to take over. + */ + if (!hdr) + panic("s390 kdump allocating elfcorehdr failed"); + /* Init elf header */ ptr = ehdr_init(hdr, mem_chunk_cnt); /* Init program headers */ |