diff options
| author | Jane Chu <jane.chu@oracle.com> | 2017-06-06 14:32:29 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-14 13:16:20 +0200 |
| commit | 7816928f3435feb5d132d739271b3a36f01cd8ff (patch) | |
| tree | cb8815728c1d35b1257e77d4651d7a485ce5cde2 /arch/sparc/Kconfig | |
| parent | 8554f96c165662c779515fadd9c9df37ec5453e7 (diff) | |
arch/sparc: support NR_CPUS = 4096
[ Upstream commit c79a13734d104b5b147d7cb0870276ccdd660dae ]
Linux SPARC64 limits NR_CPUS to 4064 because init_cpu_send_mondo_info()
only allocates a single page for NR_CPUS mondo entries. Thus we cannot
use all 4096 CPUs on some SPARC platforms.
To fix, allocate (2^order) pages where order is set according to the size
of cpu_list for possible cpus. Since cpu_list_pa and cpu_mondo_block_pa
are not used in asm code, there are no imm13 offsets from the base PA
that will break because they can only reach one page.
Orabug: 25505750
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Atish Patra <atish.patra@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/sparc/Kconfig')
| -rw-r--r-- | arch/sparc/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 56442d2d7bbc..eb9487470141 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -182,9 +182,9 @@ config NR_CPUS int "Maximum number of CPUs" depends on SMP range 2 32 if SPARC32 - range 2 1024 if SPARC64 + range 2 4096 if SPARC64 default 32 if SPARC32 - default 64 if SPARC64 + default 4096 if SPARC64 source kernel/Kconfig.hz |