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powerpc/fadump: improve fadump_reserve_mem() 

Some code clean-up like using minimal assignments and updating printk
messages. Also, add an 'error_out' label for handling error cleanup
at one place.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821343485.5656.10202857091553646948.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini 2019-09-11 20:20:41 +05:30 committed by Michael Ellerman
parent 41df592872
commit 6abec12c65
1 changed files with 27 additions and 25 deletions
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52
arch/powerpc/kernel/fadump.c
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@ -338,16 +338,15 @@ static void __init fadump_reserve_crash_area(unsigned long base,
int __init fadump_reserve_mem(void)
{
unsigned long base, size, memory_boundary;
u64 base, size, mem_boundary;
int ret = 1;
if (!fw_dump.fadump_enabled)
return 0;
if (!fw_dump.fadump_supported) {
printk(KERN_INFO "Firmware-assisted dump is not supported on"
" this hardware\n");
fw_dump.fadump_enabled = 0;
return 0;
pr_info("Firmware-Assisted Dump is not supported on this hardware\n");
goto error_out;
}
/*
* Initialize boot memory size
@ -355,7 +354,8 @@ int __init fadump_reserve_mem(void)
* first kernel.
*/
if (!fw_dump.dump_active) {
fw_dump.boot_memory_size = fadump_calculate_reserve_size();
fw_dump.boot_memory_size =
PAGE_ALIGN(fadump_calculate_reserve_size());
#ifdef CONFIG_CMA
if (!fw_dump.nocma)
fw_dump.boot_memory_size =
@ -381,10 +381,11 @@ int __init fadump_reserve_mem(void)
" dump, now %#016llx\n", memory_limit);
}
if (memory_limit)
memory_boundary = memory_limit;
mem_boundary = memory_limit;
else
memory_boundary = memblock_end_of_DRAM();
mem_boundary = memblock_end_of_DRAM();
base = fw_dump.boot_memory_size;
size = get_fadump_area_size();
fw_dump.reserve_dump_area_size = size;
if (fw_dump.dump_active) {
@ -404,8 +405,7 @@ int __init fadump_reserve_mem(void)
* dump is written to disk by userspace tool. This memory
* will be released for general use once the dump is saved.
*/
base = fw_dump.boot_memory_size;
size = memory_boundary - base;
size = mem_boundary - base;
fadump_reserve_crash_area(base, size);
pr_debug("fadumphdr_addr = %#016lx\n", fw_dump.fadumphdr_addr);
@ -418,29 +418,31 @@ int __init fadump_reserve_mem(void)
* use memblock_find_in_range() here since it doesn't allocate
* from bottom to top.
*/
for (base = fw_dump.boot_memory_size;
base <= (memory_boundary - size);
base += size) {
while (base <= (mem_boundary - size)) {
if (memblock_is_region_memory(base, size) &&
!memblock_is_region_reserved(base, size))
break;
}
if ((base > (memory_boundary - size)) ||
memblock_reserve(base, size)) {
pr_err("Failed to reserve memory\n");
return 0;
base += size;
}
pr_info("Reserved %ldMB of memory at %ldMB for firmware-"
"assisted dump (System RAM: %ldMB)\n",
(unsigned long)(size >> 20),
(unsigned long)(base >> 20),
(unsigned long)(memblock_phys_mem_size() >> 20));
if ((base > (mem_boundary - size)) ||
memblock_reserve(base, size)) {
pr_err("Failed to reserve memory!\n");
goto error_out;
}
pr_info("Reserved %lldMB of memory at %#016llx (System RAM: %lldMB)\n",
(size >> 20), base, (memblock_phys_mem_size() >> 20));
fw_dump.reserve_dump_area_start = base;
return fadump_cma_init();
ret = fadump_cma_init();
}
return 1;
return ret;
error_out:
fw_dump.fadump_enabled = 0;
return 0;
}
unsigned long __init arch_reserved_kernel_pages(void)