Le 17/10/2019 à 09:36, Andrew Donnellan a écrit :

On 10/9/19 7:16 pm, Christophe Leroy wrote:

quoted

+#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.

Christophe