On 2021/12/23 23:48, Dave Kleikamp wrote: > On 12/22/21 7:08AM, Zhen Lei wrote: >> Currently, we parse the "linux,usable-memory-range" property in >> early_init_dt_scan_chosen(), to obtain the specified memory range of the >> crash kernel. We then reserve the required memory after >> early_init_dt_scan_memory() has identified all available physical memory. >> Because the two pieces of code are separated far, the readability and >> maintainability are reduced. So bring them together. > > Rob Herring is pushing a modified version of this patch (changes made by > Pingfan Liu) to fix a regression. This will cause a conflict when it hits > mainline. Yes, I saw it yesterday, and I'll delete it in the next version. Thanks. > > https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git/log/?h=dt/linus > > https://lore.kernel.org/linux-arm-kernel/20211214040157.27443-1-kernelfans@xxxxxxxxx/ > >> >> Suggested-by: Rob Herring <robh@xxxxxxxxxx> >> Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx> >> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> >> Tested-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx> >> --- >> drivers/of/fdt.c | 15 +++++++++++---- >> 1 file changed, 11 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c >> index bdca35284cebd56..37b477a51175359 100644 >> --- a/drivers/of/fdt.c >> +++ b/drivers/of/fdt.c >> @@ -965,8 +965,7 @@ static void __init early_init_dt_check_for_elfcorehdr(unsigned long node) >> elfcorehdr_addr, elfcorehdr_size); >> } >> -static phys_addr_t cap_mem_addr; >> -static phys_addr_t cap_mem_size; >> +static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND; >> /** >> * early_init_dt_check_for_usable_mem_range - Decode usable memory range >> @@ -977,6 +976,11 @@ static void __init early_init_dt_check_for_usable_mem_range(unsigned long node) >> { >> const __be32 *prop; >> int len; >> + phys_addr_t cap_mem_addr; >> + phys_addr_t cap_mem_size; >> + >> + if ((long)node < 0) >> + return; >> pr_debug("Looking for usable-memory-range property... "); >> @@ -989,6 +993,8 @@ static void __init early_init_dt_check_for_usable_mem_range(unsigned long node) >> pr_debug("cap_mem_start=%pa cap_mem_size=%pa\n", &cap_mem_addr, >> &cap_mem_size); >> + >> + memblock_cap_memory_range(cap_mem_addr, cap_mem_size); >> } >> #ifdef CONFIG_SERIAL_EARLYCON >> @@ -1137,9 +1143,10 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, >> (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) >> return 0; >> + chosen_node_offset = node; >> + >> early_init_dt_check_for_initrd(node); >> early_init_dt_check_for_elfcorehdr(node); >> - early_init_dt_check_for_usable_mem_range(node); >> /* Retrieve command line */ >> p = of_get_flat_dt_prop(node, "bootargs", &l); >> @@ -1275,7 +1282,7 @@ void __init early_init_dt_scan_nodes(void) >> of_scan_flat_dt(early_init_dt_scan_memory, NULL); >> /* Handle linux,usable-memory-range property */ >> - memblock_cap_memory_range(cap_mem_addr, cap_mem_size); >> + early_init_dt_check_for_usable_mem_range(chosen_node_offset); >> } >> bool __init early_init_dt_scan(void *params) > > . >
