Anup Patel e435ba0524 lib: sbi_init: Avoid thundering hurd problem with coldboot_lock ...

We can have thundering hurd problem with coldboot_lock where the
boot HART can potentially starve trying to acquire coldboot_lock
because some of the non-boot HARTs are continuously acquiring and
releasing coldboot_lock. This can happen if MIP.MSIP bit is already
set for some of the non-boot HARTs.

To avoid thundering hurd problem for coldboot_lock, we use the
__smp_load_acquire() and __smp_store_release() for coldboot_done
flag and use coldboot_lock only for coldboot_wait_hmask.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>

2020-08-21 19:35:28 +05:30

..

sbi

lib: sbi_init: Avoid thundering hurd problem with coldboot_lock

2020-08-21 19:35:28 +05:30

utils

lib: utils: Use strncmp in fdt_parse_hart_id()

2020-07-29 12:13:51 +05:30