On 18/10/19 5:46 pm, Christophe Leroy wrote:
Le 17/10/2019 à 09:36, Andrew Donnellan a écrit :
On 10/9/19 7:16 pm, Christophe Leroy wrote:
+#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
+#define THREAD_SHIFT PAGE_SHIFT
+#else
#define THREAD_SHIFT CONFIG_THREAD_SHIFT
+#endif
#define THREAD_SIZE (1 << THREAD_SHIFT)
Looking at 64-bit book3s: with 64K pages, this results in a
THREAD_SIZE that's too large for immediate mode arithmetic operations,
which is annoying. Hmm.
Which operation are you thinking about ?
For instance, 'addi' can't be used anymore, but 'addis' can.
Right, I didn't look too closely - yes, they're "addi"s. But also
DS-form stores:
stdu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
Anyway, this is just the first thing that broke when I wondered whether
a ppc64le_defconfig would even build if I just switched on VMAP_STACK,
I'll work around it
--
Andrew Donnellan OzLabs, ADL Canberra
ajd@xxxxxxxxxxxxx IBM Australia Limited
