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s390/kdump: remove code to create ELF notes in the crashed system

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The s390 architecture can store the CPU registers of the crashed system
after the kdump kernel has been started and this is the preferred way.
Remove the remaining code fragments that deal with storing CPU registers
while the crashed system is still active.

Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2015-10-14 15:53:06 +02:00
parent ffa52d02c5
commit 8a07dd02d7
5 changed files with 28 additions and 63 deletions
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24
arch/s390/kernel/crash_dump.c
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@@ -72,11 +72,6 @@ static int copy_from_realmem(void *dest, void *src, size_t count)
return 0;
}
/*
* Pointer to ELF header in new kernel
*/
static void *elfcorehdr_newmem;
/*
* Copy one page from zfcpdump "oldmem"
*
@@ -390,7 +385,8 @@ static void *nt_s390_vx_low(void *ptr, __vector128 *vx_regs)
/*
* Fill ELF notes for one CPU with save area registers
*/
void *fill_cpu_elf_notes(void *ptr, struct save_area *sa, __vector128 *vx_regs)
static void *fill_cpu_elf_notes(void *ptr, struct save_area *sa,
__vector128 *vx_regs)
{
ptr = nt_prstatus(ptr, sa);
ptr = nt_fpregset(ptr, sa);
@@ -573,9 +569,6 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
/* If we are not in kdump or zfcpdump mode return */
if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP)
return 0;
/* If elfcorehdr= has been passed via cmdline, we use that one */
if (elfcorehdr_addr != ELFCORE_ADDR_MAX)
return 0;
/* If we cannot get HSA size for zfcpdump return error */
if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp.hsa_size)
return -ENODEV;
@@ -606,7 +599,6 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
hdr_off = PTR_DIFF(ptr, hdr);
loads_init(phdr_loads, hdr_off);
*addr = (unsigned long long) hdr;
elfcorehdr_newmem = hdr;
*size = (unsigned long long) hdr_off;
BUG_ON(elfcorehdr_size > alloc_size);
return 0;
@@ -617,8 +609,6 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
*/
void elfcorehdr_free(unsigned long long addr)
{
if (!elfcorehdr_newmem)
return;
kfree((void *)(unsigned long)addr);
}
@@ -629,7 +619,6 @@ ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
{
void *src = (void *)(unsigned long)*ppos;
src = elfcorehdr_newmem ? src : src - OLDMEM_BASE;
memcpy(buf, src, count);
*ppos += count;
return count;
@@ -641,15 +630,8 @@ ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
{
void *src = (void *)(unsigned long)*ppos;
int rc;
if (elfcorehdr_newmem) {
memcpy(buf, src, count);
} else {
rc = copy_from_oldmem(buf, src, count);
if (rc)
return rc;
}
memcpy(buf, src, count);
*ppos += count;
return count;
}